INTRODUCTION
SEYFERT GALAXIES AND N GALAXIES
THE NATURE OF THE *N...*Qn SEQUENCE
THE EFFECT OF DISTANCE ON THE CLASSIFICATION OF
N GALAXIES
THE PROBLEM OF NUCLEAR VARIABILITY
REFERENCES
Published in "The Astrophysical Journal", 269:
438-439, 1983 June 15.
For a PDF version of the article, click
here.
For a Postscript version of the article, click
here.
Abstract. We follow Weedman's suggestion of a spectroscopic definition for Seyfert galaxies, to present a simple four-box classification of the forms of N galaxies. The complete types for these galaxies must include a spectroscopic parameter that would show which of the Ns are also Seyferts - and the type of the Seyfert spectra in each case.
Subject headings: galaxies: structure - galaxies: Seyfert
Table of Contents
INTRODUCTION
SEYFERT GALAXIES AND N GALAXIES
THE NATURE OF THE *N...*Qn SEQUENCE
THE EFFECT OF DISTANCE ON THE CLASSIFICATION OF
N GALAXIES
THE PROBLEM OF NUCLEAR VARIABILITY
REFERENCES
